Syringe unit



A. E. SMITH SYRINGE UNIT Feb. 2, 1954 Filed March 19, 1952 4277/1/84? S/V/TW, 4 INVENTOR.

nrraeva Patented Feb. 2, 1954 :3; 1.

UNITED STATES PATENT OFFICE SYRINGE UNIT Arthur E. Smith, Los Angeles, Calif.

Application March 19, 1952, Serial No. 277,343

6 Claims. (Cl. 128-216) This invention relates to a syringe unit.

The general object of the invention is to provide an improved, highly effective syringe unit.

A more specific object of the invention is to provide a syringe wherein a recessed front member is employed as a needle support and wherein the recess is closed by a rear member integrally united with the front member.

Another object of the invention is to provide a novel disposable syringe which includes a front member and a resilient rear member, with the two members integrally united in curing to form a chamber, the volume of which is reduced when the rear member is operated to thus produce an injecting effect.

Another object of the invention is to provide a novel blown syringe.

An additional object of the invention is to provide a novel rear closure member for a syringe.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings, wherein:

Fig. l is an isometric view of the completed syringe;

, Fig. 2 is a central, sectional view through a syringe, showing my invention;

Fig. 3 is a view similar to Fig. 2, showing the parts in the position they assume when the syringe has been discharged;

Fig. 4 is an enlarged fragmentary section detail; and

Fig. 5 is a view similar to Fig. 2', showing a modification.

Referring to the drawing by reference characters, I show a syringe embodying the features of my invention, which is indicated generally at It. As shown the syringe includes a front member II and a rear member I2.

The front member includes a body I3 which has a recess I4 defined by an inner wall I5.

As shown, the body includes a peripheral flange I6 and a forwardly extending, tapered neck IT. The neck IT has a hole I8 therein which opens outwardly and at its inner end is closed by a diaphragm I9. A needle 20 is arranged in the hole I8. The needle 20 includes a ball-like protuberance 2| which is normally seated in an enlarged recess 22 in the hole I8. The hole I8 includes a second recess 23 which receives the ball 2I when the needle 29 is moved inwardly. To provide means for moving the needle inwardly it is provided with a ball-like protuberance 24. In moving the needle inwardly so that the ball 2| will move from-therecess 22 to the recess 23, the

2 I sharp point of the needle 25 will pierce the diaphragm I9, thus placing the needle into communication with the medicament M contained within the syringe.

A closure cap member 26 surrounds the needle. The closure cap is hollow as at 21 and at its rear end 28 engages the tapered neck I'I. Thus the needle 20 will be maintained in a sterile condition.

The rear member I2 includes a cylindrical body portion 40 which has a cupped-shape wall M integrally united to the front member II adjacent to the flange [6.

In order to assure that all the contents of the ampule may be discharged and to cause the rear portion I2 to engage the inner wall I5 of the front member, I provide a V=-shaped groove 42 in the rear member. This groove faces outwardly and is located at the juncture of the front and rear members so that when the rear member moves forwardly as shown in Fig. 3 this rear member will flex with the groove 42 as a hinge lineto allow complete discharge of the ampule contents.

The body of the rear member 40 is shown as cylindrical as 45 to form a collar and within the collar I secure a plug 46 which may be cemented in place and which is provided with a center hole 41, closed by a diaphragm 48.

The front and rear members I I and I2 may be made of a suitable material such as natural rub- 1 ber, artificial rubber, polyethelyne or other plastics and the parts I I and I2 may be blown integrally in the manner in which flexible bottles are blown. The plug 46 may be made of material similar to that of which the parts II and I2 are made so that the diaphragm 48 may be pierced by a filling needle. The hole made by the filling needle will be closed when the needle is withdrawn due to the resiliency of the material.

In use, after the syringe has been filled, the operator will remove the cap 26 and will place his fingers about the protuberance 24 and will move the protuberance and needle from the position of Fig. 2 to the position of Fig. 3 to place the syringe in condition for use.

The injection will then be made and slight forward pressure will be placed upon the end of the collar 45 so that some of the contents of the syringe will be discharged. The collar 45 will then be pulled rearwardly to produce an aspirating effect and if the needle has been inserted in a blood vessel, blood will appear in the recess within the syringe when the first member is made of material such as polyethelyne and will be visible through the transparent wall 1 of the come such a possibility I may insert a wire 50 in the needle bore. This wire may extend entirely through the needle and may project beyond the front end of the needle, where it is shown as bent at an acute angle to form a portion 5! and then is bent to provide a portion 52 at an acute angle to the portion 5| so that the. portion 52 extends substantiallye across the bore of the eedle. The tip r the wire is sheared as at 3- h he re s n, he need e and the c n 26 is moved into position, the part 52 moves into the cap readily until opposite a groove 54 whereupon the, wire will spring into the groove, thus connecting the wire to the can so t at when the ap is m ve the Wire is a so removed f o h needle bore.

In Fig. 5, I show a modification of the inven! i h in. ik Parts are in i ed by sin l P ed r ference numer ls. s shown t e. Wall .1" of the ear member is provided w h. an integral protuberance 60 which is formed with a wall 6! of substantially the same thickness as he a l 4 s y b owing, in a ic in die. e un ture 62, between the protuberance 60 and he all reduced in diam t pres r de a capillar openin 63 which commun cat e w n he in erior o he syr nge and t e e p: o the protu eranc 60 A fillin needle may b inser ed t rough he Wall 5i. and the openin 63 the construction b ing such th the medicament will be reta ed in the b d f t sy n e,

From. the foregoing, d scrip ion it win be apna e ht that .11 have nvented a novel disposable sy in hich is simple in ns ruction m y be readily made and filled, and Which is highly efii eien s I Having thus described my n ention, I claim:

1-. I a yringe, a on -piece b wn od rnpr sin ront member and a fl xibl rear' i em= ber, said front memb r be ng haped o fo m. a recess and said rear m m er be n sh o form a second recess u ta all m lemented '60. 1 1 .6 frontmember recess, a neck integral with, and extending r rd fr h o m m her, said neck. h vin ahole th ein pe ng u wardly, a, diaphragm closing the. inner end of said hole, said hole having a pair of enlarged, spaced recesses therein, a needle in said hole, a protuberance on said needle normally fitting the outer of Said recesses, with the needle spaced from, thediaphragi a second protuberance n said needle beyond said neck, said second men-. ti n d pro ube nce fo m n m ans by which the dle mas be mo ed inw rd y so that the nn nd t eof; p r e aid d aph agm an the first mentioned protuberance thereon is engaged in said second recess.

2. In a syringe, a one-piec blown body com- 7 prising a. frontmemberand a flexible rear member, said front member being shaped to form a recess, 'and said rear member being shaped to fornf'a second recess substantially oomplemental tol'the front member recess, a neck integral with,

and extending forwardly from, the front member, aid neck having a, hole therein opening outwardly, a diaphragm closing the inner end of said hole, said hole having a pair of enlarged, spaced recesses therein, a needle in said hole, a protuberance on said needle normally fitting the outer of said recesses, with the needle spaced from the diaphragm, a second protuberance on said needle beyond said neck, said second mentioned protuberance forming means by which the needle may be moved inwardly so that the inner 'end thereof pierces said diaphragm and the first mentioned protuberance thereon is engaged in said second recess, the rear member having a circular, hingeforming groove disposed adjacent to the juncture of the front and rear members.

3. In a syringe, a one-piece blown body comfront member being shaped to form a recess, and said rear member being shaped to form a second recess substantially complemental to the front member recess, a neck integral with, and extending forwardly from, the front member, said neck having a hole therein opening outwardly, a dia-.- phragm closing the inner end of said hole, said hole having a pair of enlarged, spaced recesses therein, a needle in Said hole, a protuberance on said needle normally. fitting the outer of said recesses, with the needle spaced from the dias phragm, a second protuberance on said needle beyond said neck, said second mentioned pro,- lberance formin means by which the ne le may be moved inwardly so that the inner end thereof pierces said diaphragm and the first mentioned protuberance thereon is engaged in said second recess, the rear-member having an open collar thereon, a plug secured in said collar, said plug having a filling hole therein, and a pierceable diaphragm closing said plug filling hole.

4. In. a syringe a one.piece blown body comprising a front member and a rear member, said front member being shaped to form a recess and said rear member being shaped to form a second recess substantially complemental to the front member recess, a neck integral with, and extending forwardly from, the front member, said neck having a hole therein opening outwardly, a diaphragm closing the inner end of said hole, said hole having a pair of enlar ed, spaced recesses therein, a needle in said hole, a protuberance on said needle normally fitting the outer of said re- Gesses, with the needle spaced from the diaphragm, and a second protuberance on said needle beyond said neck, said second mentioned protuberance forming means by which he needle may be moved inwardly so. that the innerend thereof pierces said diaphragm and the first mcns tionedprotuberance thereon is engaged in said second recess.

5. A syringe including a front member and a rear member, said front member including a body having an elongated forward end, a needle in said front member and projecting forwardly therefrom, a cap surrounding said needle, said capv havingan inwardly facing recess on the inner Wall thereof, and a wire in said needle and having the forward end thereof bent back at an acute angle with the end of the bent back portion disposed in said recess.

6. In a syringe, a body comprising a front member and a flexible rear member, Said front member being shaped to form a recess, and said rear member being shaped to form a second recess substantially complemental to the front member recess, a neck integral with, and extending forwardly from the front member, said neck having a hole therein opening outwardly, a diaphragm closing the inner end of said hole, a needle slidable in said hole, said needle having a pointed end spaced from the diaphragm, a protuberanee on said needle slidably engaging the wall of said hole, a second protuberance on said needle and spaced beyond said neck, said second mentioned protuberance forming means by which the needle may be moved inwardly so that the inner end thereof pierces said diaphragm and the first mentioned protuberance is moved along the wall of said hole.

ARTHUR E. SMITH.

References Cited in the file of this patent Number UNITED STATES PATENTS Name Date Leisenring Feb. 3, 1891 Walsh Aug. 2, 1904 Dean Aug. 29, 1905 Price Nov. 7, 1944 Safiir June 20, 1950 Smith Jan. 16, 1951 Young et a1. Apr. 24, 1951 Lockhart Jan. 13, 1953 

